Stimpak, or stimulation delivery package, is a type of hand-held medication used for healing the body. This item consists of a syringe for containing and delivering the medication and a gauge for measuring the status of the stimpak's contents. When the medicine is injected, it provides immediate healing of the body's minor wounds.

An advanced version, while it heals more severe wounds, it also has unpleasant side effects. The super version comes in a hypodermic, but with an additional vial containing more powerful drugs than the basic model and a leather belt to strap the needle to a limb, an indication of a prolonged release infusion of the drug perhaps for increased absorption. The super stimpak is much less common in the wasteland than the standard stimpak.

The auto-inject (super) stimpak is a modified stimpak which monitors vital signs, allowing for timely emergency treatment. It is used automatically from the player character's inventory when their hit points drop below 50% (25% auto-inject super stimpak) of current maximum level.

Even more advanced than a super stimpak, the ultra stimpak not only immediately heals both minor and major wounds, it also induces a strong continual regenerative effect in patients for an extended period of time after initial application. Ultra stims are, understandably, rare finds.

Health dispensers are stationary health stations found in the Anchorage Reclamation simulation, which might indicate that they were also used during the actual Anchorage Reclamation itself as well. Although immobile, they are reusable and more powerful than regular stimpaks, as they restore health to full no matter how low it is.

Stimpacks are also used by Terran soldiers in the StarCraft universe. This was published the year after the original Fallout was. "Stimpacks" are also an item that restores health in the early titles of the Doom series.